Apparatus for coating flat disks



3 Sheets-Sheet 1 INVENTOR.

RQBERT L. DYAR ATTORNEK R. L. DYAR APPARATUS FOR COATING FLAT DISK Nov. 6, 195] Filed Aug. 1, 1947 Nov. 6, 1951 R. DYAR APPARATUS FOR comm; FLAT DISK 3 Sheets-Sheet 2 Filed Aug. 1, 1947 INVENTOR. ROBERT L. DYAR Nov. 6, 1951 R. L. DYAR APPARATUS FOR comma FLAT DISK 5 Sheets-Sheet 3 Filed Aug. 1, 1947 INVENTOR.

4 ROBERT L. DYAR BY rum/v5 law 33 E Patented Nov. 6, 1951 UNITED STATES PATENT OFFICE APPARATUS FOR COATING FLAT DISKS Robert L. Dyer, Milwaukee, Wis.

Application August 1, 1947, Serial No. 765,334

(Cl. 91--l8) 2 Claims. 1

My invention relates to a method for coating flat discs on either one or both sides.

The object of my invention is to provide a means for coating one or both sides of an annular flat disc with an adhesive agent and abrasive particles.

Another object of my invention is to provide a method and device that will permit the operator to insert a flat disc into an abrasive coating device which is constructed in a manner to permit an automatic coating treatment of the disc on one or both sides without any additional manual manipulation on the part of the operator.

Still another object of my invention is to provide a means for coating one side of a disc at a time and reversing the disc without additional handling.

A still further object of my invention is to retain the coated disc in a flat position while being dried or cured for use.

It is manifest to anyone familiar with flexible flat discs employed for a grinding or polishing operation, that it is imperative that the abrasive particles be applied to the disc in a manner to hold securely by means of an adhesive agent applied to the sides of the disc. It is also manifest that the disc may be coated on either one or both sides, and it is my intention to provide a device and a method for accomplishing this operation with but a single handling by the operator.

Other and further objects of my invention will become more apparent as the description proceeds and when taken in conjunction with the drawing in which Figure 1 is a composite lay-out of the method and the arrangement of the component parts constituting the device, to provide the function for which it is intended;

Figure 2 is a composite picture of the arrangement similar to- Figure l, but showing the discs applied to a single gravity conveyor and passing through a hopper that will coat only one side of the disc with adhesive when only a single side of the disc is to have abrasive applied.

Figure 3 is a perspective view of the disc showing the method of applying a mask to the center of the disc, which mask can be removed, leaving an uncovered surface at the center where the disc is to be attached to the actuating tool.

Figure 4 is a side view of a plurality of vertical discs which constitute a gravity conveyor for conveying the adhesive coated discs during their process of being coated with abrasive.

Figure 5 is a top or plan view of the conveyor, showing the arrangement of the conveyor discs as shown in Figure 4.

Figure 6 is a cross-sectional view showing how a disc is passed through rollers which convey the adhesive agent from the reservoir at the bottom to the disc being coated.

Figure 7 is a cross-sectional view of an arrangement having a pair of rollers disposed in a manner to force a second coat of adhesive toward the disc between the particles of abrasive after the disc has been dipped.

Figure 8 is a cross-sectional'view of another modified form of device for coating the disc with an adhesive in which an additional pair of rollers guide the disc in its downward path towards the conveyor.

Figure 9 is a disc retaining frame as shown in 'Figures 1 and 2, showing the method employed for placing the discs between the perforated plates and topermit their being clamped in a flat position during the curing operation, and- Figure 10 is a fragmentarycross-sectional view of a plurality of perforated frames, stacked one on top of the other, showing the method employed for retaining the discs in a flat position.

Similar characters of reference indicate corresponding parts throughout the several views, and referring now to the same, the character I! shows a flat disc which may be made of any material and may be constructed either rigid or flexible, depending on the purpose for which the disc is to be used. This disc I0 is arranged to be inserted into a hopper II as shown in Figure 6, which hopper is provided with a reservoir portion I! containing an adhesive agent shown as I3 at its lower extremity. The disc I0 is passed between a pair of adhesive applying rollers shown as H and 14. The operator inserts a disc into the funnel type opening shown as IS in the top of the hopper II, and the adhesive is conveyed through the rotatable rollers 16 and it to the upper rollers l4 and I4 and thereby applies adhesive to both sides of the disc III. In order that this may be accomplished, the upper rollers I4 and M are in peripheral contacting engagement with rollers l6 and likewise these rollers 16 engage rollers I6. The rollers 14 and H are so located as to engage respective sides of a disc I when passed therebetween. In Figure 8 I show a similar hopper arrangement II in which the disc H1 is guided in its downward path between a pair of rollers 11 and I1 before it is disposed onto the outwardly extending ledge l8, for guiding the disc H1.

- The disc coating hopper shown as l I in Figure 1 and the lower extending edge l8 as shown in Figu-re 8 is shown placing the disc l0 onto the top of an inclined conveyor l9 which is shown in detail in Figures 4 and 5. The conveyor assembly l9 has a plurality of shafts extending between rails 2| and a plurality of discs 22 are mounted onto the shafts 20 in staggered relation to one another, thereby permitting the upper peripheral surface of the narrow conveyor discs 22 to support the abrasive disc H1 in its travel downward due to gravity. Obviously, the disc [0 coming from the hopper H is coated with the adhesive agent on both sides and is placed on the discs of the conveyor l9 and as it passes below the hopper 23 which acts as a storage unit or reservoir for abrasive materials shown as 24 it will cause the abrasive material 24 to be placed onto the disc Ill as shown at 25. When the disc l0 reaches the end of the conveyor 19 it is caused to drop downward in reverse position where it is taken up by an auxiliary conveyor 26 on which it travels in an opposite direction. The auxiliary conveyor 26 is actuated by means of a belt 40 driven by a motor 4|. In its travel downward on'the auxiliary conveyor 26 the disc I!) passes under the hopper 21, also acting as a reservoir for abrasive particles, and the abrasive is placed onto the disc H) at 28, and when the disc in reaches the end of the auxiliary conveyor 26 it is guided by the extension plates 2| and is placed between perforated metal or expanded metal frames shown as 29. These frames consist of a bottom 29 and a cover 30 hingedly supported to one another at 31. The bottom portion 29 is provided with standards or legs shown as 32 and the disc I0 is then placed between the two perforated metal frames as shown in Figure 9, and as they are clamped together by means of the clamp 33, they may be stacked one on top of the other as shown in Figure 10, and in this way air is permitted to circulate around the entire discs 10 while they dry and are retained in a fixed position.

Obviously, the surplus abrasive particles 24 terminating from the hoppers 23 and 21 are passed into a hopper 34 where a blower fan is employed at 35, which carries the particles of abrasive upward through the tubular member shown as 36 back into the top of the hopper 31, where it is again dispensed through the hoppers 23 and 21.

In Figure 2 I show the arrangement of a hopper depositing the disc II) on a single conveyor member I9. This conveyor is to be used in conjunction with the hopper arrangement ll shown in Figure 6, but wherein one of the rollers 16 and I6 are removed or put out of engagement with the roller l4. Thus one s e only of the disc 10 is coated with adhesive, in which case it would only be coated with abrasive particles on only one side from the hopper 23 as shown in Figure 1.

It is also manifest that the disc 10 may have a central portion or mask 38 adherently attached to the central portion of the disc and this portion shown as 38 in Figure 3 may be removed after the disc is completed, leaving a flat uncovered rollers 40 and 41 shown in Figure '1.

surface 39 for the attachment of the disc l0 onto a retainer or holding tool not shown.

If desired, the operator may dipthe abrasive covered disc into another reservoir of adhesive and pass the dipped disc between two pliable This will cause the adhesive agent to fillin the space between the particles of abrasive, creating added adhesive qualities.

The device illustrated, described and claimed is a mechanical means for accomplishing a suggested method for'coating either one or both sides of the disc 10. Obviously, I have shown an arrangement of the component parts constituting the device, but I am fully cognizant of the fact that many changes in the form and configuration of the component parts may bemadc without in any way affecting their efllciency or operativeness, and I reserve the right to make such changes as I may deem necessary or convenient without departing from the spirit of my invention or the scope of the appended claims.

Having thus described my invention, what I claim and desire to secure by Letters Patent in the United States is:

1. A device of the character described to be used for adhesively attaching abrasive particles to a flat annular disc, said device comprising a reservoir for containing an adhesive agent, a plurality of rollers disposed in longitudinal engagement with one another within said reservoir, means for rotating said rollers, thereby relaying said adhesive agent from one roller to another and to both sides of said disc when said disc is placed in contact with and between said rollers, a primary conveyor acting as a means for conveying said disc horizontally and having a low discharge end, means in the form of a hopper disposed above said conveyor for applying abrasive particles to the upper side of the adhesive coated disc, an auxiliary conveyor being disposed at the discharge end of said primary conveyor and positioned below the discharge end of the primary conveyor a distance not less than the thickness of said disc, nor greater than the diameter of said disc, said disc being inverted by gravity while dropping onto said auxiliary conveyor, said auxiliary conveyor carrying the inverted disc in the opposite direction to said primary conveyor, and means in the form of a hopper positioned above said auxiliary conveyor for applying abrasive particles to the upper portion of the disc positioned on said auxiliary conveyor.

2. .A device of the character described to be used for adhesively attaching abrasive particles to the flat sides of annular discs, said device comprising a reservoir for an adhesive agent, said reservoir having a pair of rollers submerged in the adhesive agent, a plurality of rollers within said reservoir, said rollers contacting said submerged rollers, a pair of adhesive applying rollers supported by said reservoir and contacting said plurality of rollers, thereby applying the adhesive agent to both sides of said discs when said ,discs are passed between said adhesive applying rollers, said reservoir being provided with an open top for inserting said discs, an aperture being formed in the bottom of said reservoir for permitting said discs to be forced out of said reservoir, 2, primary gravity conveyor having a low discharge end, said primary conveyor being arranged to receive the discs from said reservoir in a horizontal position. an auxiliary conveyor disposed below the low discharge end of said primary conveyor at a distance not less than the thickness of said discs, nor

5 greater than the diameter of said discs, to permit said discs to be deposited in inverted position onto said auxiliary conveyor and conveyed in an opposite direction to said primary conveyor, a hopper being positioned above said auxiliary conveyor and arranged to apply abrasive particles to the top of the adhesive coated discs on both conveyors, and means disposed below said conveyors for collecting the surplus abrasive particles from below said conveyors and conveying 10 said particles back to said hopper.

ROBERT L. DYAR.

REFERENCES CITED The following references are of record in the 15 file of this patent:

Number 6 UNITED STATES PATENTS Name Date Marx Dec. 15, 1914 Hafner Apr. 13, 1915 Bickett Oct. 31, 1916 Cady Sept. 14, 1926 Gosch July 18, 1933 Banner et a1 Apr. 27, 1937 Ferry June 7, 1938 Benner et al. Sept. 6, 1938 Roos July 29, 1941 Roos Aug. 11. 1942 Albertson Sept. 29, 1942 Buzonik Dec. 29, 1942 Petrilli Apr. 18, 1944 

